Draw a Ruler using QtOpenGL

[HW-Developer]

Hello Everyone, i'm trying to draw a ruler using QtOpenGL, just something like this:

And as a beginner, i can't figure out how to do it or with what i can start to draw it
So if any one has a basic example, i really appriciate it. Thank you

[kenchan]

@HW-Developer
What kind of widget do you want to draw it on?
you can start by looking here and here

[HW-Developer]

@kenchan I want to draw it on QOpenGLWidget and i want to relate it to an audio file so i can position it wherever i want